This complete upper includes the ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. The proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.
 
This upper does not include BCG or Charging Handle. 
 
INCLUDES:
M4E1 Threaded Assembled Upper Receiver
12.7" ATLAS R-ONE Handguard of choice
13.9" 5.56 Mid-Length CMV Barrel
Low Profile Gas Block and Mid-Length Gas Tube
Product comes assembled
This upper does not include BCG or Charging Handle. 
M4E1 THREADED UPPER RECEIVER FEATURES:
New enhanced forging that gives the upper receiver a "billet look"
New picatinny profile that blends seamlessly with our Enhanced Series Handguards
M4 Feedramps
.250 takedown pin holes
Laser engraved T-marks
Includes port door and forward assist installed
ATLAS R-ONE HANDGUARD FEATURES:
Full top picatinny rail
Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
Compatible with low profile gas blocks
1.3” Inside diameter
1.5” Outside diameter
Compatible with mil-spec AR15 upper receivers and barrels
13.9" 5.56 M4 CMV BARREL, MID-LENGTH FEATURES:
5.56 Nato 13.9" Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
.750 gas block journal
Mid-Length Gas System
M4 Feed Ramp Extension
HP and MPI tested
Standard A2 flash hider